MTL 4073 Passive Intrinsic Safety Barrier
The MTL 4073 is a passive intrinsic safety barrier (signal conditioning module) designed to safely interface 4-20 mA analog field devices—such as pressure transmitters, temperature sensors, and level gauges—with control systems like DCS, PLC, or SIS in hazardous areas. It limits the energy (voltage and current) transmitted to the field device to levels below those capable of igniting flammable gases or dust, ensuring compliance with intrinsic safety standards (Ex ia/ib). The device is loop-powered, requiring no external power supply, and is certified for SIL 2 safety level requirements.
Technical Specifications
Product Type: Passive analog input barrier (4-20 mA)
Channel Count: 1 channel per module
Signal Type: 4-20 mA DC input (from field transmitters)
Output Signal: 4-20 mA DC (isolated, to control system)
Power Supply: Loop-powered (no external power required)
Isolation Voltage: Up to 1500 V AC between field and system side
Intrinsic Safety Approval: ATEX, IECEx, FM, CSA (Class I, II, III, Div 1 & 2)
Certifications: IEC 60079-11 (Ex ia/ib), UL 913, EN 60079, SIL 2 (IEC 61508)
Mounting: DIN-rail mounted (standard 35 mm rail)
Termination: Screw terminals (front-accessible)
Operating Temperature: -20°C to +60°C
HART Compatibility: Yes (transparent to HART communication, 1200 bps)
IP Protection: IP65 (optional, for outdoor installations)
Passive Operation and Energy Limitation
The MTL 4073 operates as a passive device, deriving its power from the 4-20 mA loop itself, eliminating the need for external power supply wiring. It provides a safety barrier between hazardous and safe areas by limiting the voltage, current, and power that can be transmitted into the hazardous area under normal and fault conditions. The device is designed to meet the requirements of IEC 61508 SIL 2, making it suitable for use in safety instrumented systems (SIS). It is also HART transparent, allowing 2-way HART communication for configuration and diagnostics of smart transmitters.
Application Domains
The MTL 4073 is widely used in oil and gas (wellhead monitoring, pipeline pressure), chemical and pharmaceutical (reactor temperature, tank level), power generation (gas turbine monitoring), and water/wastewater treatment (gas detection in enclosed areas). Its passive loop-powered design makes it ideal for retrofitting existing loops without additional power infrastructure.
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